# if 5 > 12:
#     print("5 is greater than 12")
#     print("222222")
# else:
#     print("5 is not greater than 12")

# age = 30
# if age < 18:
#     print("You are underaged")
#     # && 不可用
# elif age >= 18 and age < 30:
#     print("You are young")
# elif age >= 30 and age < 50:
#     print("You are middle-aged")
# else:
#     print("You are old")

# 判断闰年
# year = int(input("请输入年份："))
# if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
#     print("%d是闰年" % year)
# else:
#     print("%d不是闰年" % year)

# a b c 比较大小
a = int(input("请输入a："))
# ctrl+d 复制一行
# ctrl + alt + L 格式化代码
b = int(input("请输入b："))
c = int(input("请输入c："))
if a > b:
    if a > c:
        print("a is the largest")
    else:
        print("c is the largest")
else:
    if b > c:
        print("b is the largest")
    else:
        print("c is the largest")


# 计算器实现加减乘除
num1 = float(input("请输入第一个数字："))
num2 = float(input("请输入第二个数字："))
op = input("请输入运算符：")
if op == "+":
    print(num1 + num2)
elif op == "-":
    print(num1 - num2)
elif op == "*":
    print(num1 * num2)
elif op == "/":
    print(num1 / num2)
else:
    print("输入错误")





